Sign PDF
Free online PDF signer: sign PDF documents with digital signature by drawing, typing, or uploading a signature. 100% private in-browser with zero uploads.
Compress PDF Online Free
Free online PDF compressor: reduce PDF file size with extreme, recommended, or low compression levels. 100% private in-browser with zero file uploads.
Choose a PDF file or drag & drop it here
Reduce PDF file size while maintaining optimal visual clarity and page layout
100% In-Browser Privacy — Files never leave your device
How to compress and reduce PDF file size online
Drop your PDF document into the compression workspace or browse your local files to load your multi-page document.
Select a compression preset: Extreme (max reduction), Recommended (balanced), or Light (print quality).
Click 'Compress PDF' to initiate real-time canvas stream downsampling and structural object compaction.
Review your exact megabyte savings and percentage reduction, then download your optimized PDF instantly.
Examples
- Input
- Scanned Mortgage Deed: 8-page document containing 300 DPI phone camera scans totaling 18.4 MB
- Output
- Compressed using 'Recommended' preset down to 3.2 MB (82.6% reduction) with pristine document legibility
Downsamples heavy raster XObjects while maintaining exact physical page dimensions and aspect ratios.
- Input
- Corporate Quarterly Presentation: 24-slide deck with embedded graphics totaling 12.5 MB blocking email send
- Output
- Compressed using 'Extreme' preset down to 2.1 MB (83.2% reduction) passing standard 5 MB email limits
100% private in-browser WebAssembly processing; confidential financial decks never touch an external server.
Frequently asked questions
How do I compress a PDF document using Toolhast?
Upload your PDF document into the workspace or click 'Try Sample PDF'. Select your preferred compression tier from Extreme, Recommended, or Light. Click 'Compress PDF' to downsample embedded images and compact object streams. In seconds, view your file size savings and download your lightweight PDF file.
Will compressing my PDF make the text unreadable or blurry?
No. Our 'Recommended' preset balances compression with visual clarity, keeping text sharp while shrinking heavy embedded photo streams. For print documents requiring maximum typographic sharpness, choose 'Light Compression'. Only 'Extreme Compression' applies aggressive downsampling, which is specifically designed for email attachments and strict web portal upload limits.
How much file size reduction can I expect from compression?
Reduction depends on document composition. PDFs containing high-resolution smartphone scans or uncompressed camera photos routinely compress by 60% to 85% without noticeable degradation. Documents consisting purely of vector text, spreadsheets, or already-compressed web graphics typically compress by 15% to 35% through object stream and structural compaction.
What is the difference between Extreme, Recommended, and Light compression?
Extreme Compression downsamples images to 72 DPI with 55% JPEG quality for maximum size reduction (~70% savings). Recommended Compression optimizes images to 120 DPI with 75% quality for everyday business sharing (~50% savings). Light Compression preserves 180 DPI resolution at 88% quality for professional printing (~30% savings).
Can I compress large multi-page scanned PDF documents?
Yes. Toolhast easily handles multi-page scanned contracts, presentation decks, and technical manuals. Our engine processes pages sequentially with real-time progress tracking. Because processing executes directly inside your browser memory, there are no arbitrary file size limits, queue delays, or server upload timeouts associated with cloud services.
Is it safe to compress confidential legal, financial, or medical PDFs here?
Yes, 100%. Toolhast executes all document decoding, canvas downsampling, and PDF serialization purely inside your local browser memory sandbox. Your sensitive tax forms, legal contracts, medical records, and business agreements are never uploaded, stored, or transmitted to external servers or third-party cloud data centers.
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